21023313211 has 32 divisors (see below), whose sum is σ = 24107466240. Its totient is φ = 18211474944.

The previous prime is 21023313191. The next prime is 21023313247. The reversal of 21023313211 is 11231332012.

It is not a de Polignac number, because 21023313211 - 2⁷ = 21023313083 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21023313271) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1757296 + ... + 1769218.

It is an arithmetic number, because the mean of its divisors is an integer number (753358320).

Almost surely, 2^21023313211 is an apocalyptic number.

21023313211 is a deficient number, since it is larger than the sum of its proper divisors (3084153029).

21023313211 is a wasteful number, since it uses less digits than its factorization.

21023313211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12115.

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 21023313211 its reverse (11231332012), we get a palindrome (32254645223).

The spelling of 21023313211 in words is "twenty-one billion, twenty-three million, three hundred thirteen thousand, two hundred eleven".